Tests: Disable MFC test for IntelLLVM due to #18311

clang-cl cannot deal with implicit dependencies in UTF16 files
(see #18311).  IntelLLVM inherits this behavior from Clang.  The
MFC test uses `rc` in the way described in #18311 and gets the same
error described in #18311.  Disable the test until #18311 is fixed.

Signed-off-by: William R. Dieter <william.r.dieter@intel.com>
10 jobs for intel-llvm3
Status Name Job ID Coverage
  External
passed cdash

passed ghostflow-check-master

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager